Why is the energy transfer between trophic levels not even close to 100% efficent?

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

Study the image of this rock. which characteristic best supports its formation from sedimentary processes? it has many layers. it is coarse-grained. its grain shape is round. its texture is non-banded.

The pronunciation aid that determines the stress placed upon a syllable is the